Sfi System - Diagnosis: Other Lexus RX II

PRECAUTION

Note. When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected.

1. Lighting System (Adaptive Front-Lighting System) (See step 15 under «PRE-CHECK»(ref-215924-S11546719002006011900000) )
2. Power Window Control System (See step 16 under «PRE-CHECK»(ref-215942-S26575838012006011900000) )
3. Power Back Door System (See step 8 under «PRE-CHECK»(ref-215952-S33097522602006011900000) )
4. Sliding Roof System (See step 7 (Standard Type) or step 8 (Multi-Panel Moon Roof Type) under «PRE-CHECK»(ref-215958-S23137570092006011900000) )

Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assy, engine assy or ECM.

HINT

Initialization can not be completed by only removing the battery.

Scheme 744

Scheme 745

Scheme 746

Scheme 747

Scheme 748

Scheme 749

Scheme 750

Scheme 751

Scheme 752

Scheme 753

Scheme 754

Scheme 755

Scheme 756

Scheme 757

Scheme 758

Scheme 759

Scheme 760

Scheme 761

Scheme 762

Scheme 763

1. DIAGNOSIS SYSTEM Description When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you need to connect the vehicle to the OBD I scan tool complying with SAE J1978 or the hand-held tester, and read the various data output from the vehicle's ECM. OBD II regulations require that the vehicle's on board computer illuminates the Malfunction Indicator Light (MIL) on the instrument panel when the computer detects a malfunction in the emission control system/components or in the powertrain control components which affect vehicle emissions, or in the powertrain control components which affect vehicle emissions, or a malfunction in the computer. In addition to the MIL illuminating when a malfunction is detected, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the ECM memory (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ). If the malfunction does not reoccur in 3 consecutive trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory. To check the DTC, Connect he hand-held tester or OBD II Scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The hand-held tester or OBD II scan tool also enables you to erase the DTC and check the freeze frame data and various forms of engine data (for operating instructions, see the OBD II scan tool's instruction book). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set as prescribed by the SAE, while manufacturer controlled codes can be set freely by a manufacturer within the prescribed limits (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ). The diagnosis system operates in the normal mode during normal vehicle use. It also has a check mode for technicians to simulate malfunction symptoms and troubleshoot it. Most DTCs use the 2 trip detection logic* to prevent erroneous detection, and to ensure a through malfunction detection. By switching the ECM to the check mode when troubleshooting, a technician can cause the MIL to illuminate for a malfunction that is only detected once or momentarily (hand-held tester only) (see step 3). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected again during the second drive test, this second detection causes the MIL to illuminate (2nd trip) (However, the ignition switch must be turned OFF between the 1st trip and 2nd trip). Freeze frame data: The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction Priorities for troubleshooting: If troubleshooting priorities for multiple DTCs are given in the applicable DTC chart, these priorities should be followed. If no instructions are given, perform troubleshooting for those DTCs according to the following priorities. DTCs other than fuel trim malfunction (DTCs P0171, P0172, P0174 and P0175) and misfire (DTCs P0300 - P0306). Fuel trim malfunction (DTCs P0171, P0172, P0174 and P0175). Misfire (DTCs P0300 - P0306). Check the DLC3. The vehicle's ECM uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. HINT: If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the OBD II scan tool or hand-held tester to the DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual. Inspect the battery voltage. Battery Voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the MIL. The MIL comes on when the ignition switch is turned ON and the engine is not running HINT: If the MIL is not illuminated; troubleshoot the MIL circuit (See «MIL CIRCUIT»(ref-209540-S40253222742005121000000) ). When the engine is started, the MIL should go off if the lamp remains on, it means that the diagnosis system has selected a malfunction or abnormality in the system.
2. DTC CHECK (Normal Mode) NOTE: If there is no DTC in the normal mode, check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester. Hand-held tester only: When the diagnosis system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the DTCs and freeze frame data, and then write them down. Checking DTCs using the OBD II scan tool or hand-held tester. Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and then write them down. If you need help with the OBD II scan tool, refer to the scan tool's instruction book. If there is no DTC in the normal mode, check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check for DTCs, use the normal mode. For codes on the DTC chart subject to "2 trip detection logic", perform either of the following actions. Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL lights up and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clearing the DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. When operating an OBD II scan tool (complying with SAE J1978) or the hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.) Clearing the DTCs not using the OBD II scan tool or the hand-held tester. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses from the fusible link block for more than 60 seconds.
3. DTC CHECK (Check Mode) HINT: Hand-held tester only: Compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode. Procedure for Check Mode using the hand-held tester. Check the initial conditions. Battery positive voltage 11 V or more Throttle valve fully closed Transmission in the P or N position A/C switched OFF Turn the ignition switch OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Switch the hand-held tester from the normal mode to the check mode (check that the MIL flashes). NOTE: If the hand-held tester switches the ECM from the normal mode to the check mode or vice-versa, or if the ignition switch is turned from ON to ACC or OFF during the check mode, the DTC and freeze frame data will be erased. Start the engine (MIL goes off after the engine starts). Simulate the conditions of the malfunction described by the customer. NOTE: Leave the ignition switch ON until you have checked the DTC, etc. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC and freeze frame data, etc. HINT: Be sure not to turn the ignition switch OFF, as turning it OFF switches the diagnosis system from the check mode to the normal mode, which erases all the DTCs, etc. After checking the DTC, inspect he applicable circuit. Clearing the DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD I scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. When operating an OBD II scan tool (complying with SAE J1978) or the hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.) Clearing the DTCs not using the OBD II scan tool or the hand-held tester. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses from the fusible link block for more than 60 seconds.
4. FAIL-SAFE CHART If any of the following codes are recorded, the ECM enters the fail-safe mode.
5. CHECK FOR INTERMITTENT PROBLEMS Hand-held tester only: By putting the vehicle's ECM in the check mode, the 1 trip detection logic is possible instead of the 2 trip detection logic, and the sensitivity to detect faults is increased. This makes it easier to detect intermittent problems. Clear the DTCs (See step 2). Set the check mode (See step 3). Perform a simulation test (See «SYMPTOM SIMULATION»(ref-215923-S02520245562006011900000) ). Check the connector and terminal (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-215923-S29911983652006011900000) ). Wiggle the harness and the connector (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-215923-S29911983652006011900000) ).
6. DATA LIST HINT: Using the DTA LIST displayed by the hand-held tester or the OBD I scan tool, you can read the value the switches, sensors, actuators and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one method to shorten diagnostic time. NOTE: The values given below for "Normal Condition" are representative values. A vehicle may still be normal even if its value differs from those listed here. Do not solely depend on the "Normal Condition" here when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester or the OBD II scan tool. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST". According to the display on tester, read the "DATA LIST".
7. ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester or the OBD II scan tool. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST". According to the display on tester, perform the "ACTIVE TEST".
8. DEFINITION OF TERMS
9. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used in this manual along with their definitions.
10. The monitor will run whenever the following DTCs are not present (Monitor disablement List). HINT: This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on the left are being set.

MONITOR RESULT (MODE 06 DATA)

HINT

1. MODE 06 DATA represents monitoring results (Test Data) and thresholds (Test Limit) for each diagnostic item when judging whether a component and system is normal or abnormal.
2. Test ID stands for components or systems in each diagnosis. Comp ID is a divisional description for each Test ID.

Scheme 764

Scheme 765

Scheme 766

1. READ MODE 06 DATA (using the hand-held tester) Connect the hand-held tester to the DLC 3. Enter "MONITOR RESULT" from "DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT" on the hand-held tester. You will see "Test ID" and "INCMP", "Pass" or "Fail" on the MONITOR RESULT screen. HINT: INCMP: The judgement has not been done yet. PASS: Normal is detected. FAIL: Malfunction is detected. Select a Test ID that you want from the list and press the "ENTER" button. You will see the following screen: VAL (TEST VALUE) [Test Data] [Unit] LMT (TEST LIMIT) [Test Limit] [Unit] TLT [Test Limit Type] By pressing the "HELP" button, you can see more information. HINT: MODE 06 DATA indicates the latest malfunction judgement result of this diagnostic. TEST VALUE indicates the detection parameter value (Example: P0128 Thermostat Malfunction = Engine coolant temperature) at the time of malfunction (or normal) judgement is done. TEST LIMIT indicates a threshold of malfunction judgement (Example: P0128 Thermostat Malfunction = 75°C). By comparing TEST VALUE and TEST LIMIT here, it is possible to know the failure degree. (At normal judgement time, how much leeway is available from MIL ON.) If the MIL is ON and the item in the MODE 06 DATA that is applicable to the stored DTC indicates "PASS", then function may be intermittent problem, so that reproduction the problem may be troublesome.

Scheme 767

Scheme 768

Scheme 769

Scheme 770

1. PURPOSE OF THE READINESS TESTS The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components and report any detected abnormalities in the form of Diagnostic Trouble Codes (DTCs). Since the various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors. Many state Inspection and Maintenance (I/M) programs require that vehicles complete their Readiness Monitors prior to beginning an emission test. The current status of the Readiness Monitors can be seen by using the hand-held tester with version 9.0 software (or newer), or a generic OBD II Scan tool. To view the Readiness Monitor status using the hand-held tester, select "Monitor Status" from the Enhanced OBD II Menu. A status of "complete" indicates that the necessary conditions have been met to run the performance tests for the related Readiness Monitor. The Readiness Monitor will be reset to "incomplete" if: ECM has lost power (battery or fuse). DTCs have been cleared. The conditions for running the Readiness Monitor have not been met. In the event that any Readiness Monitor shows "incomplete", follow the appropriate Readiness Monitor Drive Pattern to active the monitor and change the readiness status to "complete". CAUTION: Strictly observe of posted speed limits, traffic laws, and road conditions when performing these drive patterns. NOTE: These drive patterns represent the fastest method to satisfy all necessary conditions which allow the specific readiness monitor to complete. In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other factors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to "complete". To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).
2. CATALYST MONITOR (A/F SENSOR TYPE) Preconditions The monitor will not run unless: MIL is OFF. Engine Coolant Temperature (ECT) is 80 °C (176°F) or greater. Intake Air Temperature (IAT) is - 10°C (14°F) or greater*. NOTE: *2002 and later MY vehicles: The readiness test can be completed in cold ambient conditions (less than - 10°C / 14°F), if the drive pattern is repeated a second time after cycling the ignition off. Drive Pattern Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Drive vehicle at 40 to 55 mph (64 to 88 km/h) for approximately 4 minutes. NOTE: Drive with smooth throttle operation and avoid sudden acceleration. If IAT was less than 10°C (50°F) when the engine was started, drive the vehicle at 40 to 55 mph (64 to 88 km/h) for additional 4 minutes. Drive vehicle allowing speed to fluctuate between 40 to 50 mph (64 to 80 km/h) for about 16 minutes. NOTE: Drive with smooth throttle operation and avoid sudden closure of the throttle. Check the status of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure preconditions are met, turn ignition off, and then repeat steps (2) and (3).
3. EVAP MONITOR (VACUUM PRESSURE MONITOR) NOTE: A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pressure Readiness Monitor. Cold Soak Preconditions The monitor will not run unless: MIL is OFF. Fuel level is approximately 1/2 to 3/4 full. Altitude is 7,800 feet (2,400 m) or less. Cold Soak Procedure Let vehicle cold soak for 8 hours or until the difference between IAT and ECT is less than 7°C (13°F). HINT: Examples: Scenario 1 ECT = 24°C (75°F) IAT = 16°C (60°F) Difference between ECT and IAT is 8°C (15°F). --> The monitor will not run because difference between ECT and IAT is greater than 7°C (13°F). Scenario 2 ECT = 21°C (70°F) IAT = 20°C (68°F) Difference between ECT and IAT is 1°C (2°F). --> The monitor will run because difference between ECT and IAT is less than 7°C (13°F).
4. EVAP MONITOR (VACUUM PRESSURE MONITOR) (CONTINUED) Preconditions The monitor will not run unless: MIL is OFF. Fuel level is approximately 1/2 to 3/4 full. Altitude is 7800 feet (2400 m) or less.* Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F). Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F).* Cold Soak Procedure has been completed. Before starting the engine, the difference between ECT and IAT must be less than 7°C (13°F). HINT: Examples: Scenario 1 ECT = 24°C (75°F) IAT = 16°C (60°F) Difference between ECT and IAT is 8°C (15°F). --> The monitor will not run because difference between ECT and IAT is greater than 7°C (13°F). Scenario 2 ECT = 21°C (70°F) IAT = 20°C (68°F) Difference between ECT and IAT is 1°C (2°F). --> The monitor will run because difference between ECT and IAT is less than 7°C (13°F). NOTE: *NOTE for 2002 and later MY vehicles: The readiness test can be completed in cold ambient conditions (less than 4.4°C / 40°F) and/or high altitudes (more than 7,800 feet/2,400 m) if the drive pattern is repeated a second time after cycling the ignition off. Drive Pattern Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Release pressure in fuel tank by removing the fuel tank cap and then reinstalling it. Start the engine and allow to idle until ECT is 75°C (167°F) or more. Run the engine at 3,000 RPM for about 10 seconds. Allow the engine to idle with the A/C ON (to create slight load) for 15 to 50 minutes. NOTE: If the vehicle is not equipped with A/C put a slight load on the engine by doing the following: Securely set the parking brake. Block the drive wheels with wheel chocks. Allow the engine to idle in drive for 15 to 50 minutes. Confirm the status of the readiness monitor on the scan tool display.
5. OXYGEN/AIR FUEL RATIO SENSOR MONITOR (FRONT A/F SENSOR AND REAR O2S SYSTEM) Preconditions The monitor will not run unless: MIL is OFF Drive Pattern Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Start the engine and it to idle for 2 minutes or more. Drive the vehicle at 40 to 70 mph (64 to 112 km/h) or more for at least 150 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more. Drive the vehicle at 25 mph (40 km/h) or more for at least 40 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more. Perform steps (5) and (6) ten times. Check the status of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure preconditions are met, turn ignition off and then repeat steps (1) through (6).
6. OXYGEN / A/F SENSOR HEATER MONITOR Preconditions The monitor will not run unless: MIL is OFF Drive Pattern Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Start the engine and allow it to idle for 500 second or more. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes. Check the status of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure preconditions are met, turn ignition off and then repeat steps (2) and (3).

TYPICAL ENABLING CONDITIONS

Sequence of operation

Scheme 771

Scheme 772

Scheme 773

Scheme 774